1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2012 Regents of the University of California 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #ifndef _ASM_RISCV_PGTABLE_BITS_H 7*4882a593Smuzhiyun #define _ASM_RISCV_PGTABLE_BITS_H 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * PTE format: 11*4882a593Smuzhiyun * | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 12*4882a593Smuzhiyun * PFN reserved for SW D A G U X W R V 13*4882a593Smuzhiyun */ 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #define _PAGE_ACCESSED_OFFSET 6 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #define _PAGE_PRESENT (1 << 0) 18*4882a593Smuzhiyun #define _PAGE_READ (1 << 1) /* Readable */ 19*4882a593Smuzhiyun #define _PAGE_WRITE (1 << 2) /* Writable */ 20*4882a593Smuzhiyun #define _PAGE_EXEC (1 << 3) /* Executable */ 21*4882a593Smuzhiyun #define _PAGE_USER (1 << 4) /* User */ 22*4882a593Smuzhiyun #define _PAGE_GLOBAL (1 << 5) /* Global */ 23*4882a593Smuzhiyun #define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */ 24*4882a593Smuzhiyun #define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */ 25*4882a593Smuzhiyun #define _PAGE_SOFT (1 << 8) /* Reserved for software */ 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun #define _PAGE_SPECIAL _PAGE_SOFT 28*4882a593Smuzhiyun #define _PAGE_TABLE _PAGE_PRESENT 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun /* 31*4882a593Smuzhiyun * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to 32*4882a593Smuzhiyun * distinguish them from swapped out pages 33*4882a593Smuzhiyun */ 34*4882a593Smuzhiyun #define _PAGE_PROT_NONE _PAGE_READ 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #define _PAGE_PFN_SHIFT 10 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun /* Set of bits to preserve across pte_modify() */ 39*4882a593Smuzhiyun #define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \ 40*4882a593Smuzhiyun _PAGE_WRITE | _PAGE_EXEC | \ 41*4882a593Smuzhiyun _PAGE_USER | _PAGE_GLOBAL)) 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun #endif /* _ASM_RISCV_PGTABLE_BITS_H */ 44